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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
lub/oil pressure release
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<blockquote data-quote="timetraveller" data-source="post: 10268" data-attributes="member: 456"><p>Lindie is correct. The pressure release valve is only on the feed to the big ends, cams etc. Roller bearing big ends as used on Vincents are not capable of holding a significant pressure and the Vincent type of oil pump will wear quickly if it tries to provide pressure. Various people have tried to measure the oil pressure obtained with a hot Vincent engine and it is about 1 lb/square inch. Negligible! Possibly about 5 lb/sq inch when cold and if using an old style single grade oil. I too have seen them jammed shut but with no sign of problems with the engine. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="timetraveller, post: 10268, member: 456"] Lindie is correct. The pressure release valve is only on the feed to the big ends, cams etc. Roller bearing big ends as used on Vincents are not capable of holding a significant pressure and the Vincent type of oil pump will wear quickly if it tries to provide pressure. Various people have tried to measure the oil pressure obtained with a hot Vincent engine and it is about 1 lb/square inch. Negligible! Possibly about 5 lb/sq inch when cold and if using an old style single grade oil. I too have seen them jammed shut but with no sign of problems with the engine. :) [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
lub/oil pressure release
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